Overview
The MC74AC138DR2G, produced by onsemi, is a high-speed 1-of-8 decoder/demultiplexer. This device is particularly suited for high-speed bipolar memory chip select address decoding and demultiplexing applications. It features three binary weighted address inputs (A0, A1, A2) and provides eight mutually exclusive active-LOW outputs (O0-O7). The device includes multiple input enables, allowing for easy parallel expansion to higher-order decoders.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| VCC (DC Supply Voltage) | 2.0 to 6.0 | V | |
| VI (DC Input Voltage) | -0.5 to VCC + 0.5 | V | |
| VO (DC Output Voltage) | -0.5 to VCC + 0.5 | V | |
| IOH (Output Current - High) | -24 | mA | |
| IOL (Output Current - Low) | 24 | mA | |
| TSTG (Storage Temperature Range) | -65 to 150 | °C | |
| TA (Operating Ambient Temperature Range) | -40 to 85 | °C | |
| tPLH (Propagation Delay An to On) | 1.5 to 15.0 | ns | VCC = 5.0 V, CL = 50 pF |
| tPHL (Propagation Delay An to On) | 1.5 to 14.0 | ns | VCC = 5.0 V, CL = 50 pF |
Key Features
- High-speed 1-of-8 decoder/demultiplexer
- Multiple input enables for easy parallel expansion (E1, E2 - active-LOW, E3 - active-HIGH)
- Active-LOW mutually exclusive outputs
- Outputs source/sink 24 mA
- TTL compatible inputs for the MC74ACT138 version
- Pb-Free devices
- Capable of being used as an 8-output demultiplexer
Applications
- High-speed bipolar memory chip select address decoding
- Demultiplexing applications
- Parallel expansion to higher-order decoders (e.g., 1-of-24 or 1-of-32 decoders)
- General digital logic circuits requiring decoding or demultiplexing functions
Q & A
- What is the primary function of the MC74AC138DR2G?
The MC74AC138DR2G is a high-speed 1-of-8 decoder/demultiplexer.
- How many address inputs does the MC74AC138DR2G have?
The device has three binary weighted address inputs (A0, A1, A2).
- What is the output configuration of the MC74AC138DR2G?
The device provides eight mutually exclusive active-LOW outputs (O0-O7).
- Can the MC74AC138DR2G be expanded to higher-order decoders?
- What is the maximum output current of the MC74AC138DR2G?
The outputs can source/sink up to 24 mA.
- Is the MC74AC138DR2G Pb-Free?
- What are the operating temperature ranges for the MC74AC138DR2G?
The operating ambient temperature range is -40°C to 85°C.
- What is the typical propagation delay for the MC74AC138DR2G?
The typical propagation delay ranges from 1.5 to 15.0 ns depending on the conditions.
- Can the MC74AC138DR2G be used as a demultiplexer?
- What package options are available for the MC74AC138DR2G?
The device is available in SOIC-16 and TSSOP-16 packages.
